Reef
both
Level 5/10

Cobblestones

East Sumbawa, Indonesia
🪸Sharp reef

Cobblestones is a small channel break near Lakey Peak in East Sumbawa, offering both lefts and rights on a compact reef. The wave provides a fun option when the main breaks are too crowded or too big, with shorter rides and a more relaxed atmosphere. It's one of several satellite breaks in the Hu'u area that extends the surfable options beyond the famous Lakey Peak and Lakey Pipe.

Cobblestones surf forecast

Model forecast for swell, wind and tide.

10-Day Forecast
Today4
80
Firing
1.5m@14s
10km/h
Thu5
82
Firing
1.5m@15s
10km/h
Fri6
85
Firing
1.4m@13s
8km/h
Sat7
79
Good
1.6m@16s
9km/h
Sun8
81
Firing
1.7m@15s
9km/h
Mon9
85
Firing
1.4m@15s
9km/h
Tue10
83
Firing
1.2m@14s
6km/h
Wed11
64
Fair
1.1m@12s
7km/h
Thu12
82
Firing
1.5m@14s
9km/h
Fri13
80
Firing
1.6m@14s
10km/h
5+ days out, less certain

Today's Conditions

Find Flights
Best session: MorningAM 4 km/h · PM 14 km/h · Tide at 11am (0.9m)
Swell
1.5m
SSW(206°)
Score: 25/25
Period
14s
Groundswell
Score: 25/25
Wind
10km/h
SSE(162°)
Score: 13/25
Weather
30°C
0.0mm18%
First light 5:06amSunrise 5:36amSunset 6:03pmLast light 6:33pm
Windswell
0.1m@1s
Secondary
0.2m
Confidence
100%

Location & Conditions

Loading map...
Swell1.5m @14s SSW in window
Wind10 km/h SSE cross-shore
SwellWind: Offshore Cross Onshore
Showing forecast for today · all day

Hourly Forecast, Tide & Strike Windows

Strike window: 7:51am–3:15pm · through lowIdeal tide: 0.5–1.5m
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
6am
9am
12pm
3pm
6pm
°C
26°
31°
32°
32°
28°
26°
31°
32°
32°
28°
27°
32°
32°
32°
28°
26°
30°
31°
31°
29°
27°
30°
32°
32°
29°
27°
31°
32°
31°
28°
28°
29°
30°
30°
28°
28°
29°
31°
31°
29°
28°
30°
32°
32°
29°
28°
30°
32°
32°
29°
2m1.0
sec
14s
14s
14s
14s
14s
15s
15s
15s
15s
15s
13s
13s
13s
13s
13s
16s
16s
16s
16s
16s
15s
15s
15s
15s
15s
15s
15s
15s
15s
15s
14s
14s
14s
14s
14s
12s
12s
12s
12s
12s
14s
14s
14s
14s
14s
14s
14s
14s
14s
14s
swell
windkm/h
2g9
6g22
14g39
14g37
14g37
5g10
6g21
14g37
13g36
14g33
4g13
3g16
12g34
11g35
8g23
4g8
5g21
14g42
11g40
10g32
2g12
5g19
12g34
14g39
13g39
2g9
4g20
13g37
15g45
9g44
5g14
6g21
8g32
8g37
4g35
1g8
2g15
9g32
13g41
10g40
2g13
5g17
11g31
14g39
10g40
5g18
7g23
12g33
14g40
12g43
tidem
4:54am1.9m
11:40am0.9m
6:25pm2.1m
12:46am1.0m
6:39am1.9m
12:48pm0.8m
7:19pm2.3m
1:47am0.7m
7:47am2.1m
1:39pm0.7m
7:58pm2.6m
2:32am0.5m
8:35am2.2m
2:19pm0.7m
8:32pm2.7m
3:07am0.2m
9:15am2.3m
2:56pm0.7m
9:05pm2.8m
3:40am0.1m
9:52am2.4m
3:30pm0.6m
9:35pm2.9m
4:13am0.0m
10:23am2.4m
4:00pm0.6m
10:05pm2.9m
4:42am0.0m
10:54am2.3m
4:30pm0.7m
5:11am0.0m
11:23am2.3m
4:56pm0.7m
5:40am0.2m
Ideal tideStrike windowNight

Tide times today

4:54 am
High · 1.88m
11:40 am
Low · 0.86m
6:25 pm
High · 2.07m
Times shown in spot-local time.

Strike Score Breakdown

80
Firing
Components
Swell Direction19/25
Swell Size25/25
Swell Period25/25
Wind13/25
Raw Score82/100
Adjustments
🌊 Tide+3
💨 Gusty Wind-5
Adjusted Score80/100
Confidence
Multiplier×1.00
Final Score80
🌊 Mostly in the tide window

Plan Your Strike

Return flights to BMU, departing today with a 5-day trip window.

Search Flights on Skyscanner
See where's firing right nowToday's best waves worldwide, scored live
Free Strike Report

Know when Southeast Asia is about to fire

Get the best strike windows in Southeast Asia — and worldwide — in your inbox every Monday & Thursday. Live Strike Scores, the swell behind them, zero fluff.

Free forever. Two emails a week. Unsubscribe anytime.

For real surf travel

Get the full Cobblestones trip window

Pro unlocks the 10-day forecast window, unlimited alerts, and custom spot tracking that help turn a good-looking surf report into a better travel decision.

10-day window

See the trip window before flights get expensive.

Unlimited alerts

Let the app watch your score threshold for you.

Custom spots

Track the breaks that actually matter to your travel plans.

Swell Requirements

Optimal direction
SW (215°)
Direction range
200° - 230°
Size range
0.9m - 1.8m
Ideal size
1.3m - 1.6m
Height multiplier
1.03×
Ideal period
14s+

Wind Requirements

Optimal direction
E (90°)
Offshore range
60° - 120°

Tide Requirements

Optimal tide
mid
Optimal range
0.5m - 1.5m

Water temp

28°C

Wetsuit

Boardshorts / Rashguard

Difficulty

5/10

Crowd level

4/10

Frequently Asked Questions

What kind of wave is Cobblestones?

Cobblestones is a reef break in East Sumbawa, Indonesia, with peaks that run both left and right.

What swell works best at Cobblestones?

Cobblestones picks up swell from the SSW round to the SW, and it's best when it's coming straight out of the SW. That's a tight window, so it needs the swell direction to line up. It starts working at around 0.9m and handles up to about 1.8m, with the sweet spot around 1.3 to 1.6m. Period matters too: aim for 14s or longer, as anything under 10s tends to be weak. These are the numbers our scoring uses, so treat them as a guide rather than a promise.

What wind is offshore at Cobblestones?

An E wind is dead offshore at Cobblestones, and anything from the ENE round to the ESE keeps it clean. The morning is typically the best window, roughly 6am to midday. Light winds from other directions can still be fine; strong offshores can make it hard to get into waves.

What tide is best at Cobblestones?

Cobblestones is at its best around mid tide, roughly 0.5m to 1.5m on the local chart.

When is the best time of year to surf Cobblestones?

The most reliable run of swell at Cobblestones comes Apr to Oct. There's a second window in Nov to Mar too. Best Apr-Oct (dry season, SE trades offshore). Swells year-round but wet season brings onshore winds.

How cold is the water at Cobblestones?

The water at Cobblestones averages around 28°C, so boardshorts or a rashguard will do. It shifts a few degrees through the year, so check the season before you pack.

Is Cobblestones good for beginners?

It's more of an intermediate wave, rated 5/10 for difficulty, so newer surfers are best off sticking to the smaller days. Expect a moderate crowd (4/10) when it's on. Things to watch for: sharp, shallow reef (booties help).

How do I get to Cobblestones?

The nearest airport on our list is BMU, then it's roughly a 30-minute drive.

What other surf spots are near Cobblestones?

The closest breaks we track are Lakey Peak (0.4 km), Lakey Pipe (1.1 km) and Nungas (1.1 km), handy when Cobblestones isn't working. We track 4 spots around East Sumbawa in total.

Best Season

Peak: Apr-Oct

Secondary: Nov, Dec, Jan, Feb, Mar

Best Apr-Oct (dry season, SE trades offshore). Swells year-round but wet season brings onshore winds.

Getting There

Airport
BMU
Drive time
30 min
Data quality
community

Strike Log

Community Discussion